Im having the exact same issue rang today was given a 18 digit code which didnt work as its a 25 digit code for xbox not sure what to do as its closed the case
Hi @vickyb1,
Thank you for posting and welcome to the Community. I'm sorry if you were given the wrong code and could not activate the Game Pass. If you send me your details, I'll be able to get this investigated.
I have sent you a private message with instructions for contacting the team. You can access your messages via the envelope icon at the top right of the screen, or click on this link, Private messages
Thanks,
Paddy